Improvement in double-acting force-pumps



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O. SCHMIDT. Double Acting Force-Pump.

No. 205,688. Patented July 2,1878.

mw/zi mm I1 llllllll'll Nv PETERS. PNOTO-LITNOGRAPHER, WASHINGTON D C 0.SCHMIDT. Double Acting Force-Pump.

No. 205,688. Patent-ed July 2,1878.

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NITED STATES PATE CHRISTIAN SCHMIDT, OF LANCASTER, PENNSYLVANIA.

Specification forming part of Letters Patent No 205,688, dated July 2,1878; application filed March 18, 1878.

To all whom it may concern:

Be it known that I, CHRISTIAN SCHMIDT, of Lancaster, in the county ofLancaster and State of Pennsylvania, have invented certain new anduseful Improvements in Double- Acting Force-Pumps; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, which will enable others skilledin the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, which form a part of this specification, and inwhich Figure 1 is a front view. Fig. 2 is a side elevation. Fig. 3 is atop plan. Fig. 4 is a vertical transverse section. Fig. 5 is a sectionalview of one of the valve-chambers. Fig. 6 is a sectional view after theline 00 0c, Fig.3; and Fig. 7 shows, in perspective, one of the valvesdetached from the pump.

Similar letters of reference denote corresponding parts in all thefigures.

This invention relates to certain improvements in double-actingforce-pumps, as I shall now proceed more fully to describe withreference to the drawings hereto annexed, in which- Ais the body of thepump, and B B are the top and bottom pieces, respectively. The body A isa cylinder having at the top and bottom laterally-projecting wings a a,connected by tubes 1) b, which may be cast in one piece with thecylinder. The top and bottom pieces have each two valvechambers, O C (J0 each of which consists of a double cylinder, forminga continuouschamber, and secured with a screwbolt, apiece of leather or rubberpacking be ing interposed.

The tube 1) connects at its lower end with a perforation, d, in thebottom piece B, from which a channel or passage, 0, formed or cast inthe bottom piece, leads to the valve-chamber where it terminates at thevalve f, which, like the rest of the valves, consists of a metallic diskor cup having an upwardlyprojecting stem, in which a recess is formed,so that it may slide upon a stem or rod, f, projecting downwardly fromthe top of the valve-chamber. From the valve-chamber 0 another channelor passage leads to the bottom of the cylinder. From thence a thirdpassage leads to the valve-chamber 0 Where its opening is covered by avalve, and from the chamber Oa fourth passage leads to the tube 1), withwhich the exit-pipe is connected.

Similarly, the tube 1), at its upper end, connects with a hole in thetop piece B, from which a passage leads to valve-chamber 0, where itopens under a valve. From chamber 0 a passage leads to the top of thecylinder, and from thence a third passage to valvechamber 0, where itsopening is covered by a valve. From valve-chamber G a fourth passageleads to the exit-pipe through tube 0.

In the center of the cylinder a perforated diaphragm, D, is rigidlysecure-d, having a central bearing for the piston-rod E. The lattercarries two pistons, of which the lower one, F, is solid, while theupper one, G, has two valves opening upwardly.

The operation and advantages of my improved pump will be readilyunderstood from the foregoing description, taken in connection with thedrawings hereto annexed.

The tubes 1) b may be branched ofi, so that the water may be taken fromtwo or more places and delivered through several pipes withoutinconvenience.

The general construction is simple, the valves and chambers being allalike, as well as the top and bottom pieces, which may both be cast inthe same mold. It is easily operated, the stroke of the piston-rod beingvery short, and the stream delivered by the pump is continuous andunbroken, owing to the arrangement of the valvechamhers, which alsoserve as air-chambers.

The courseof the water through the pump is as follows: When the pistonis moved upward, the water enters through tube 1), perforation d,passage 6, under the valve fin chamber 0 from whence it passes to andfills the bottom of the cylinder. At the same time the water in theupper portion of the cylinder is forced under the valve in chamber 0,which it fills, and is from thence forced out through tube 1). On thedownstroke the water passes through tube 1) into chamber 0, and fromthence into the upper portion of the cylinder, while the water containedin the bottom thereof is forced into chamber and from thence out throughtube 1).

The valves of my improved pump operate by gravity, and are soconstructed and arranged that they cannot possibly be displaced; hencethe pump is not apt to get out of order, no matter how much it is used.

Having thus described my invention, I claim 2. The improved double-acting pump herein described, consisting of the cylinder A, havingwings a a, connected by open tubes 1) b, diaphragm I), secured midway inthe cylinder, piston-rod E, having pistons F G, and top and bottompieces B B, having passages, Valves, and valve-chambers O C O O, allconstructed, arranged, and operating substantially as herein described,for the purposes shown and specified.

In testimony that I claim the foregoing as my own I have hereto aflixedmy signature in presence of two witnesses.

CHRISTIAN SCHMIDT.

IVitnesses:

BENJAMIN W. HARNISH, WILLIAM B. PYFER.

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